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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7411) Refactor and improve decommissioning logic into DecommissionManager
Date Tue, 10 Feb 2015 22:09:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315051#comment-14315051
] 

Tsz Wo Nicholas Sze commented on HDFS-7411:
-------------------------------------------

> ... with pause time being the most important one. ...

It is not necessary the most important in all the cases.  Consider a large cluster with many
datanode, say 4000, but few data so that each datanode only has few number of blocks, say
< 100.  Then the admin decide to reduce the size of the cluster dramatically, say 2000.
 With setting 100k blocks per node, it could decommission > 1000 nodes per iteration. 
Is it the intended behavior?

> As usual, I'll sign myself up to fix any issues that surface, so there's no worry about
ongoing maintenance.

Thanks for signing it up.  What if you are unavailable later on?  What if there is a bug you
don't know how to fix?

> Refactor and improve decommissioning logic into DecommissionManager
> -------------------------------------------------------------------
>
>                 Key: HDFS-7411
>                 URL: https://issues.apache.org/jira/browse/HDFS-7411
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.5.1
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: hdfs-7411.001.patch, hdfs-7411.002.patch, hdfs-7411.003.patch, hdfs-7411.004.patch,
hdfs-7411.005.patch, hdfs-7411.006.patch, hdfs-7411.007.patch, hdfs-7411.008.patch, hdfs-7411.009.patch,
hdfs-7411.010.patch
>
>
> Would be nice to split out decommission logic from DatanodeManager to DecommissionManager.



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